Ricerc@Sapienza

This paper focuses on an entropy based formalism to speed up the evaluation of the Structural SIMilarity(SSIM) index in images affected by a global distortion. Looking at images as information sources, avisualdistortion typical setcan be defined for SSIM. This typical set consists of just a subset of information belongingto the original image and the corresponding one in the distorted version. As side effect, some general theoreticalcriteria for the computation of any full reference quality assessment measure can be given in order to maximizeits computational efficiency.

Notes on semiotics and ethology: a (partially interrrupted diagolgue. The success of the chomskyan paradigm, combined with the anthropocentric turn of semiotics, has determined, since the seventies, a sort of divorce between semiotic studies and the ethological research. However, ethology, especially in its variant known as ‘cognitive’ ethology, has continued to use semiotic terminology in its approach to the communicative behavior of non-human animals.

Motivated by recent theoretical challenges for 5G, this study aims to position relevant results in the literature on codedomain non-orthogonal multiple access (NOMA) from an information-theoretic perspective, given that most of the recent intuition of NOMA relies on another domain, that is, the power domain. Theoretical derivations for several code-domain NOMA schemes are reported and interpreted, adopting a unified framework that focuses on the analysis of the NOMA spreading matrix, in terms of load, sparsity, and regularity features.